Hakey j



H. J; aoswormi,

LIGHT SUPPORT Otiinl Filed July 21...l 1924 2 sfigata-Sheet. 1

Oct'. 28., 1930. H. ,1. B'swoRTH lig-17,845

LIGHT 'suPPvon'I original Filed July 21.. 1924 2 sheets-smb 2 I :Il: I

. .v Illll if,...

Reissuecl Oct. 28, 1930 UNirlazD [STATES `'PArr-:Nr v ori-ICE i HARRY J. BOSWORTH, Oli-CHICAGO, ILLINOIS, ASSIGNOR TO HARRY J'. BOSWOTH COM- PANY, 0F CHICAGO, ILLINOIS, A CORPORATION OF ILLINOIS f LIGHT SUPZPOR'Iv Original No. 1,644,231, dated October `4=, 1927, Serial No. 727,166, filed July 2,1', 1924. Application for reissue filed November 18,

An object of the invention is the provision of a light ment in in a vertical and in a horizontal plane and extensibleV to permit adjustment of the arc or radius of angular adjustment, also counterbalanced to be retained in any position into support capable of angular adjustwhich the light is moved or adjusted, with means for varying or adjusting the counterbalancing action to counterbalance the light in its various extended and retracted positions, as Well as in its various angular posiy tions. j

Another object is thevprovision of a generally improved and simplified construction' that may be inexpensively produced, one that is strong and durable and adapted for quick and easy and more or less universal intallation.

TheV invention provides a construction in which the foregoing is attained and, at the same time, carrying `of an electric conductor `or conductors in the support or training or threading of same through the support is permitted without danger of injuring the' conductor or conductorsA in the adjustment of the support or bracket to its various positions or by the counterbalancing action set up or counterbalance adjusting means providedand in which none of said actionsis impaired by the carrying "of the conductor or conductors in the support. o Y To vacquaint -those skilled inthe art with the manner of vand means for practicing my present invention, I willnow describe in connection with the accompanying drawings forming a part of this specification, a particular embodiment of the invention.

In the drawings Fig. 1 is a side elevationalview of a light support embodyingthe improvements ofl my invention; j

Fig. 2 is a vertical sectional view longitudinally through the carrying arm of the supdiii'erent directions, as for example,

suitably formed for 1927. Serial No. 234,285.

port and through the lmounting and light or lamp carrying ends thereof;

Fig. 3 is an enlarged vertical section on line j 3/-3 of Fig. 2; y j I Fig.`A 4 is a horizontal section on line 1 -4 of Fig. 2; L v

Fig. 5 is a detail section on line 5--5 of Fig. 2; Fig. 6 is a plan View of the lamp or light carryingend ofthe arm.

Referring to they drawings, v10 designates the supporting bracket of the iixture, and' 12 i the light or lamp support in its entirety.

The supporting bracket 10 comprises a base 13 which maybe apertured or otherwise bolting or other suitable attachment to the wall or other support 15.

The basepl has outwardly extending ends 16 provided with concentric openings 17.

The light or lamp carrying arm comprises a pair of telescoping tubes 20 and 21, the tube 21 being suitably secured at 22 in the tubular projection 23 of a mounting head 211. The head 2a is mounted for swinging movement in avertical plane between a pair of cooperating head "members 25 and 26 upon a pin or post comprising a bolt 27 which extends through the head members 25 and 26 and through the `sidewalls ofthe head member 24 and has threaded engagement with a wing nut 28.

rlhe head members 25 and 26 have inturned margins or flanges 30 which engage the circular wall 31 of the head member 24 and provide a smooth, balancedswinging movement in a `vertical direction of the light arml about the axis of the pin or bolt 27.

The head members 25 and 26 have depending semi-circular portions 32 for receiving the upper end of a tubular post or rotatable cylinder 63, said post 33 having at its upper end,l a circumferential frange orl bead 34 for securing the parts against separation when the head members are ciamped together. Post 33 Vis rotatably mounted in the concentric openings 17 of bracket '13, the lower edges of the depending semi-circular` portions 32 of head members 25 and 26 affording a shoulder which engages the upper outturned end 16 of bracket 13 and thereby supports the mounting post 33 therein.

Pivoted at its upper end between the sides ofhead member 24 uponl a pin 35 secured at its opposite ends in the side walls of head member 24,.is anarm 36. This arm 36 which" 4is preferably tubular, for a purpose which will hereinafter appear, extendsv `down into.v

' thetubular post 3,3 'and slidable upon said arm within the post 33 is acollar 'i371 "The f arm is extensible'and retractihle forthe'purn t cylinder 33 and'ifully-movable withoutintelL fering with or injuring the conductors. In-

`terposed between collar 37 and an inwardly extendingflange BSonhead members 25 and 26 is a coiled spring 40. `A nut-42 threaded upon the arm 36 transmits the tension of spring 40to thearm 36 and thereby to the light supporting arm of the fixture, and said nut 4'2 is 1 adjustable on `the armBG' for the purpose of adjusting the tension of` spring 40. The circularv wall 3l of headmember 24 is `cut away 'or removed` at 45 to permit'the upper endv of .arm 36 toeiitend; betweenthe side wallsofsaid head member and ftoacvcommodate saidarmiu the various relative positionsofitand'theheadzmemberf24. i g Fromthefforegoingit will' appear that the light Suppralle?farm 1231s pirotalyupiwled on thetopof the lcylinder This 'disposes theysupportfor this arm f;orconvenientA` access `below "thepivotal imounting and' yIper; mits jmaxmumjupward swmgwithout the.

possibility `of interference..

posewof'varying the distance,ofmthe'v .light froinlthe lsupporitpand: therebyithe arcor; path ofA movementj in bothplanes of its swinging adjustment. 'This'extensionand retractionfis securedy by sliding `movement-of the tubeQQ .int'ogand out of the .tube 21. "Although a nut orother suitable means may be `provided yfor vloclinfgthe tube 20 inany desiredjediended` orA retracted position, the tubef20 ispreferably held by friction j andk the counterbalancing action so that a nut needinotbeloosened .i and tightened each. time.v 4Fixedly mounted f n uponthe outer endv oftube is ya light sup,-

` porting itvtinrr 52 having e dewenardly arene' ing mouth 53 in which and between the vsides of the fitting isjpivotedyat 54 faypendantfliglitr support.

j `Whilethe particularformjof light may. be widely Varied, that showny comprises a lower transluoent bowl or open4 topped. globe and an :upper shade G2. The lower` endof the pendant supportfjmay be iared" at 63 fandpinternally threadedat G4 for mounting the shade and light thereon andtheupper pivoted end isshown as beingslightly en i y6() larged; yThepivotal mounting of the pend- -ant support Vflpeiinits the lightl to assume a verticalr position inA all angularandother ad-y f justedlpositions of the support.

`In-use the arm`12ha`s pivotal orvswinging movement in a verticalplane aboutipivot 27f As lalready pointed out, the light carrying and the light may be swung into any desired' positionabout said pivot.r The coiled spring 40 is adjusted to counterbalance the arm and light in its various positions about pivot 27 so thatupon swinging the light into the desiredipositionabout pivot 27, it will `be counterbalanced and thereby retained or'held in saidl position by spring 40.4 The light may vbe swungin .a horizontal'plane by turning or rotation ofpost33' in ithe. openings 16 aboutk the airis thereof, and the distance of the light from ythe support is increased' yor decreased,

`and its l path ofl swinging movement' about pir/01327 in vertical plane and about post'y in a horizontal plane may be thereby adjustH ed by extension or retraction -of the telescoping arms20 andv21., The simple rextension or retraction of` arm 20 therebynot only changes `or adjustsgthe position of thelight without further adjustment, butadjusts both arcs of Swinging`movement,` of the light. This, in

Vmei'nbers25, 24 and 26 with cooperating friotionally engaging surfaces and 72. As thelength of the arml2 isincreased, a slight ytightening up of wing "nut 28v will increase the friction i between surfaces 70"l so thatthe springv40 will again properly counterbalance thelsupport `or arm in` its various angular positions. "If the lengtlrofthe arm 12 is further increasechthe nut28 maybe againdrawn up or tightened to further increasejthis resistance and4 theredit) ier

vby furtherincrease'the Cfou'nte'rbalaneing:` ae-` .creased,"loosening/ofV the nut "28 vwill decrease the friction between `-the `surfaces 70 j and 72 with van accompanyingfdecrease in the counterbalancing actionysosthat it will be apparentA that'A the ,light may belfproperly counterbalanced lall adjusted ,posi-l yTheconductors75 which" supplyjcurrent vtfthe'lamp76 are preferably of ythe Hex; ible type;v Theylead into the lowerl open end,` o'fsupp orting; tubeBS, up' into 'the' lower i open endffof'tubularfarm 36,'through arm 36 j vand outffthrugh an. opening 78 in :one side :thereof below. pivot 35 land Vadj acent pivot 27,@anfd are `trained"through heady 24 about pivot 27, out throughtheftubular farm 41,2 and down throughpen'dantsupport' about pivot 54to thelampv-ZG `with which-they have suitable connectiom'as for example, b'y'means 'or any otherpreof" a vstandard ."Edisonw ferred type-offsocket or connecting member. f

Owing to the manner in which'the conduc- K connection with the tor extends through the tubular mounting post, tubular counterbalancing arm, open head and light carrying arm, there is no danger of twisting or other injury to the conductor by the swinging or other adjusting movement of the support. The counterbalancing means in no way interferes with the conductor nor does the conductor in any way interfere with the counterbalancing means nor with the various adjusting movements of the support. TheI parts are simple and relatively inexpensive in construction and assembly, and the support is strong and durable and adapted for quick and easy and more or less universal installation and the light is capable of angular' adjustment in vertical and horizontal planes and it is also extensible and retractible from the support. The light and light arm are counterbalanced to be retained into any position into which adjusted and the cooperation of the head members 24, and 26 with the nut 28 provides for conveniently adjusting the counterbalancing action to take care of extension and retraction of the light carr ing arm. The bolt 27 forms the pivot a out which the arm is adapted to be swung in a vertical plane and at the saine time said bolt provides for increasing and decreasing the counter-balancing action to properly counter-balance the arm and light in its different extended and retracted positions. The support is easily adjusted and the light can be put just where it is needed without effort.

The upper shade G2 is preferably a diffusing shade and the lower shade is preferably of glass or other suitable translucent material, the opening between the shades being especially suitable for ventilating the lamp 7 6.

While I have described the invention in details of a particular embodiment, it is to be understood that various lights and fixtures may be carried at the outer end of the light arm and that other modiiications and changes may be made within the scope of the invention.

The support is particularly adapted for wall mounting, but it is in nowise limited to such mounting, but may be mounted upon other suitable support. In fact, it may be mounted on the drill supporting or other dental equipment about the patients chair, for example, or it may be mounted interchangeably or in connection with a fan support, tool support, or other supports that are commonly employed with such equipment.

Use of my improved bracket for carrying a telephone or the like and for attaching an operating light to present dental units now on the market, is contemplated. The bracket provides for conveniently bringing the light up' close tothe field ofoperation, which' has not been possible before. f

I claim':- 2

' 1. In a support of the character described, the combination of a mounting bracket having relatively ixedsupport, a hollow post journaled to turn in'said bracket upon a vertical axis, anextensible arm adapted for the reception at its outer end of an article to be supported and pivoted at its inner end upon a horizontal pivot carried by the upper end of said post forswinging movement about the horizontal axis of said pivot, friction means adjacent said pivot with externally exposed and quickly accessible means for adjusting said friction means for different extended and retracted conditions of said arm, spring means confined within said hollow post and operatively associated with the pivoted end of said arm for counter-balancing said arm in a given extended position and in accordance with the weight of the article supported thereby and means accessible from the lower end of said post for adjusting said counter-balancing spring independently of the adjustment of said friction means to provide a spring counter-balancing action in accordance with the weight of the article supported by said arm.

2. In a support of the character described, the combination of a mounting bracket having relatively fixed support, a hollow post journaled to turn in said bracket upon a vertical axis, an extensible arm adapted for the reception at its outer end of an article to be supported and pivoted at its inner end upon a horizontal pivotl carried by the upper end of said post for swinging movement about the horizontal axis of said pivot, friction means adjacent said pivot with externally exposed and quickly accessible means for adjusting said friction means for different extended and retracted conditions of said arm, a rod pivoted to the inner end of the article supporting arm eccentrically of the horizontal pivot therefor and extending into the hollow post, spring means confined within said hollow post and operatively associated with said rod for counter-balancing said arm in a given extended position and in accordance with the weight of the article supported thereby and means on said rod and accessible from the lower end of said post for adjusting said counter-balancing spring independently of the adjustment of said friction means to provide a spring counter-balancing action in accordance with the weight of the article supported by said arm.

3. In a lighting fixture for the purpose specified, the combination of a wall bracket, a rotatable cylinder containing therein a plunger, a resisting spring contained within the cylinder, and a light-supporting arm pivotally` supported` on the top of the; cylinder and provided with a, portion pivotedto said plunger eccentrcally of the pivotalupport vQfsaidv lightfsupportingarm-0n1 the top of the. cylinder whereby the`l plunger tendsto counter-balance the arm andret-ain it in a given position of adjustment..

` InV Witness Wheeoj,y I hereunto `subsclibe my namey this 15th day of' November, 1927.`

. HARRY J BOSWORTH. 

